Guo Huai (died 255), courtesy name Boji, was a military general of the state of Cao Wei during the Three Kingdoms period. He started his career in the late Eastern Han Dynasty as a military officer under the warlord Cao Cao. During Cao Pi's reign, he rose up the ranks and became a subordinate of the Wei marshal Sima Yi. Guo Huai defeated the Qiang and Di tribes several times and defended Cao Wei from Jiang Wei's campaigns.
Guo Huai had a somewhat prestigious heritage. His father was a commandery Grand Administrator, and his grandfather had been the Minister of Finance, one of the Nine Ministers of the Han court. He came to work for Cao Pi, who was the General of the Gentlemen of the Household for All Purposes at the time, in 205 and Cao Pi was very impressed by Guo Huai. He told his father of Guo Huai and by 214 he had been promoted to be one of Cao Cao’s personal advisers.
In 215, Cao Cao led a campaign against Zhang Lu in Hanzhong and brought along Guo Huai as an adviser during this campaign. After a brief battle, Zhang Lu surrendered to Cao Cao. Subsequently, Cao Cao left Xiahou Yuan in charge of pacifying the northwest (which he had been doing since 211 anyway), and he left Guo Huai behind to advise Xiahou Yuan. The two got along extremely well and Guo Huai became Xiahou Yuan’s Major, making him second-in-command of Xiahou Yuan’s personal troops
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